Dredge.



PATENTED FEB.1'7,1903.

F. H. STOLP.

DREDGE. APPLICATION FILED AUG. 5, 1901.

H0 MODEL.

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WITNESSES m: mama PEYERS co.. mom-1.1mm wwmamga. n. c.

UNITED STATES PAT NT OFFICE.

FRANK H. STOLP, OF CHICAGO, ILLINOIS, ASSIGNOR TO FRANK K. HOOVER,

OF KANSAS CITY, ILLINOIS.

MISSOURI, AND ARTHUR J. MASON,'OF CHICAGO,

final-zoos.

SPECIFICATION forming part of Letters Patent No. 720,983, dated February17, 1903.

Application filed August 5, 1901.

To aZZ whom it may concern: I

Be it known thatl, FRANK H. Sronr, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Dredges, of which thefollowing is a specification. The present invention relates to thatclass of devices that are used for dredging or for m grabbing and takingup at one point and depositing at another any material, wet or dry,capable of being scooped up, in which the bucket consists of two partsadapted to be drawn together for the purpose of closing the I5 bucketand scooping up or grabbing a load and adapted to be forced apart orallowed to separate and discharge the load when the de sired point ofdischarge is reached, this class of devices being known as' clam shelldredges, regardless'of' the meansused for manipulating the bucket or itscomponent parts or of the material which it is used to handle. Theobject of the invention is'to provide improved means for manipulatingthe two 2 5 parts of the bucket to the end that their action inseparating to open the bucket shall be quick and positive and to thefurther end that they shall completely empty themselves, and in order toaccomplish this latter the two 0 parts of the bucket are in the openingprocess brought to positions in which their hot toms reach vertical orsubstantially'vertical positions.

In carrying out these objects of the inven- 5 tion I use a system ofarms herein called the closing-arms and a second system of arms hereincalled the openingarms, the arms of the two systems being so articulatedand related that a pull upon the closing-cable, which 40 is immediatelyassociated with the closingarms,will cause the bucket to close,while apull upon the opening-cable, which is immediately associated with theopening-arms, will cause the bucket to open, each of the two parts of 5the bucket being carried partly by the closing-arms and partly by theopening-arms.

I am aware that it is not broadly new in a device of the class describedto use a system of arms corresponding with the arms herein Serial No.70,905. (No model-3 I am the first to connect the bucket with theopening-arms in such a manner that as the arms are moved under theinfluence of a pull upon the opening-cable the two parts of the bucketwill be quickly tilted and brought to the position above described withtheir hottoms vertical, or practically so.

Preferably I connect the two parts of the bucket with the opening-armsthrough the medium of links pivoted tothe opening-arms and to the twoparts of the bucket; but I desire to have it understood that in itsbroadest aspect my invention is not limited-thereto, but, on thecontrary, includes any means for connecting the o'peniug-ar'mswitb thetwo parts of the bucket, so that in the process of opening the bucketthe movement Will be transmitted from the opening-arms to the two partsof the ;5

bucket and the latter thereby quickly tipped for the purpose ofcompletely emptying them. The invention consists in the features ofnovelty that are herein described.

In the accompanying drawings, which are made a part of thisspecification, Figure 1 is a plan view of a clam-shell dredge embodyingthe invention, the parts being shown in the positions which they occupywhen the bucket is open. thereof, the positions which the parts occupywhen the bucket is closed being indicated by dotted lines.

O, 0 O and G are the closing-arms; which are pivotal] y connected inpairs throughthe 90 medium of a pin or shaft ,0, about which they arefree to move,the two arms upon each side of said pin being so connectedthat they move in unison. Upon the shaft 0 are journaled a pair ofpulleys S and S and upon shafts 9 5 or pins Y and Y are journaledpulleys S, S S, and S respectively.

T represents the closing-cables, which are Fig. 2 is a side elevationthis system of cables and pulleys it is manifest that if an upward pullbe exerted upon the'cables the effect will be to draw the two pairs ofpulleys S S and S S toward each other, as indicated by dotted lines inFig. 2.

B B 13 B are the' opening-arms, which are pivoted to shafts or pins E E,that are carried by the closing-arms, each of the two pairs B B and B Bof the opening-arms being also pivotally connected to the sockets D D towhich the opening-cables K are attached. The two parts H H of the bucketare pivotally connected to the closing-arms, as at X X and theopening-arms are connected to the buckets through the medium of links LL L L. The pivotal connections between the links and correspondingopeningarms are at I, 1 I and I respectively, and

' the pivotal connections between the links and pivotally connecting thetwo parts of the bucket with the closing-arms, opening-arms, meanspivotally connecting the opening-arms to the closing-arms, and linksconnecting the opening-arms with the two parts of the bucketsubstantially as described.

3. In a clam-shell dredge the combination of a two-part bucket,closing-arms pivotally connected with each other, means pivotallyconnecting the two parts of the bucket with the closing-arms, means fordrawing the closing-arms together for the purpose of closing thebucket,opening-arms pivotally connected with the closing-arms andarranged after the manner of toggles, and links connecting theopening-arms with the two parts of the bucket substantially asdescribed.

FRANK I-I. STOLP.

Witnesses:

L. M. HOPKINS, W. G. NOTHACKER.

